Facile fabrication of highly catalytic-active Ag 2 CO 3 /AgBr/graphene oxide ternary composites towards the photocatalyt
- PDF / 2,242,867 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 57 Downloads / 163 Views
RESEARCH ARTICLE
Facile fabrication of highly catalytic-active Ag2CO3/AgBr/graphene oxide ternary composites towards the photocatalytic wastewater treatment Mingzhi Si 1 & Wenguang Wang 1,2
&
Qifang Guan 1 & Haiyan Zhang 1,2 & Madhusudan Puttaswamy 3
Received: 29 February 2020 / Accepted: 6 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Ag2CO3/AgBr/graphene oxide (Ag2CO3/AgBr/GO) ternary composites with different percentages of GO were fabricated by a facile co-precipitation strategy. The composites were characterized in the aspect of phase composition, light absorption performance, and micromorphology etc. The activity of the composites was studied by photocatalytic degradation of colored organic dye (rhodamine B, RhB) and colorless organics (phenol) under the shine of visible light. The optimized Ag2CO3/AgBr/GO-7.5 composites revealed the most excellent photocatalytic activity, which exhibited an apparent reaction rate constant exceeding that of pristine AgBr and Ag2CO3 by a factor of 107 and 5.63, respectively. The outstanding performance can be attributed to the effective separation of electrons and holes as well as the strong light absorption ability resulting from the Ag2CO3/AgBr/GO heterostructure. Moreover, it was verified that h+ and •O2− were two major active substances responsible for the decomposition of organic pollutants according to the free radical-trapping experiments. Besides, a probable reaction mechanism referring to the charge transfer and separation in the composites was proposed and discussed in detail. Keywords Ag2CO3 . Graphene . Ternary composites . Photocatalysis . Free radicals
Introduction With people’s raising awareness of energy shortage and environmental pollution, the pace of developing solar energy is getting faster all over the world. Semiconductor-based photocatalysts with potential application for purification of organic pollutants have drawn wide attention (Shi et al. Responsible Editor: Sami Rtimi * Wenguang Wang [email protected] * Haiyan Zhang [email protected] 1
School of Materials and Energy, Guangdong University of Technology, Guangzhou Higher Education Mega Center 100#, Guangzhou 510006, People’s Republic of China
2
Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Guangzhou 510006, People’s Republic of China
3
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, People’s Republic of China
2019; Mao et al. 2019; García-Muñoz et al. 2019; Doan et al. 2019; Puttaswamy et al. 2013). Among various sorts of photocatalytic materials, TiO2 has become one of the most promising green photocatalysts for environmental protection owing to its advantages such as good oxidation ability, photostability, environmental friendliness, and low cost (Wang et al. 2012; Guo et al. 2019; Zheng et al. 2014; Chen et al. 2020; Lv et al. 2017). However, this traditional photocatalyst can only respond to ultraviolet light (accounting for ca. 4% of the solar spectrum)
Data Loading...
